Dear,
I'm new to GRASS and experimenting. I have a location specified and want to import some rasterdata (aerial imagery) that is not referenced yet. I have this data in A/I ASCII GRID format. When I try to import it, I loose evrything, since it's ll corner coordinates as defined in the header are outside the LOCATION - region. Do I specify a dummy location and import all files here before registring the images, or is there a more elegant solution?
Regards,
Kris
On Fri, Oct 10, 2003 at 03:43:41PM +0200, Kris Nackaerts wrote:
Dear,
I'm new to GRASS and experimenting. I have a location specified and want
to import some rasterdata (aerial imagery) that is not referenced yet. I
have this data in A/I ASCII GRID format. When I try to import it, I
loose evrything, since it's ll corner coordinates as defined in the
header are outside the LOCATION - region. Do I specify a dummy location
and import all files here before registring the images, or is there a
more elegant solution?
The problem is that unreferenced data are imported with
negative coordinates by r.in.gdal. So try
#-e extends the default location:
r.in.gdal -e in=aaigrid out=yourrastermap
g.region -p rast=yourrastermap
d.mon x0
d.rast yourrastermap
Then you can use i.group, i.target, i.points, i.rectify or
i.ortho.photo to get a referenced/orthorectified aerial image.
Hope this helps,
Markus